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Premier Guarantee will accept the use of non-combustible cavity tray products for warranty purposes on a project by project basis prior to provision of full third party certification. Below highlighted in green are acceptable subject to conditions. Highlighted in amber currently require further clarification for full acceptance. Highlighted in red are not currently acceptable for warranty purposes.
It is important that inspections are carried out by Façade Manager/MPM or MPS, the site manager and a representative of the manufacturer to confirm that the cavity trays are installed in accordance with manufacturers’ instructions. The trays should be inspected once they have been bedded on a mortar bed and prior to subsequent brickwork progressing. Bespoke water testing should be carried out when benchmarking. Whilst we may not insist on test conditions of 1.5litres/lm/min for up to three hours where brickwork is proposed, this should be agreed prior.
| Manufacturer | Approval in principle? | Caveats |
| ACS G-Tray | YES | Site specific designs required. This should include full details of laps/seals, fixings, corners/specials, weep vents. Structural engineer’s confirmation the movement expected is acceptable for each design (this should not be an issue when fixed to sheathing board only). |
| IG Keyfix | YES | Site specific designs required. This should include full details of seals, corners/specials, weep vents. Structural engineer’s confirmation the movement expected is acceptable for each design (with exception of NCCT1). |
| Dorsey Stainless Steel Cavity Tray | YES | Site specific designs required. This should include full details of laps/seals, fixings, corners/specials, weep vents. Structural engineer’s confirmation the movement expected is acceptable for each design (this should not be an issue when fixed to sheathing board only). |
| Visqueen Zedex non-combustible cavity tray | YES | Site specific designs required. This should include full details of laps/seals, fixings, corners/specials, weep vents. Structural engineer’s confirmation the movement expected is acceptable for each design (this should not be an issue when fixed to sheathing board only). The BBA are conducting the Factory Production Control (FPC) Certificate, i.e., auditing Visqueen batch control measures and verifying all testing. Although this is not a mandatory requirement of the CE mark, we await confirmation batches are controlled by a third party as agreed. |
| Metz – Zinc Cavity Tray | NO | Concern over zinc alkali in mortar with test evidence awaited. Concern over Bi-metallic corrosion specifically in relation to aluminium. Site specific designs required showing distance of laps/rolls, joints (concern over movement for long sections - structural engineer’s confirmation the movement expected can be tolerated)/seals/laps, stop ends, weeps, corner details, etc. |
| ENVIROGRAPH – Cavity Tray | NO | Product is satisfactory in terms of fire with several design considerations outstanding for cavity tray product acceptance. |
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Every care was taken to ensure the information in this article was correct at the time of publication. Guidance provided does not replace the reader’s professional judgement and any construction project should comply with the relevant Building Regulations or applicable technical standards. For the most up to date Premier Guarantee technical guidance please refer to your Risk Management Surveyor and the latest version of the Premier Guarantee Technical Manual.